U.S. patent application number 11/134788 was filed with the patent office on 2006-11-23 for protective cover device for a sawing machine.
Invention is credited to Yueh-Hsun Chang.
Application Number | 20060260456 11/134788 |
Document ID | / |
Family ID | 37447099 |
Filed Date | 2006-11-23 |
United States Patent
Application |
20060260456 |
Kind Code |
A1 |
Chang; Yueh-Hsun |
November 23, 2006 |
Protective cover device for a sawing machine
Abstract
A protective cover device includes a supporting member secured
to a worktable of a sawing machine, a cantilever having rear and
front pivot ends pivoted to the supporting member and a cover
shield by rear and front journal pins, respectively. At least one
of the rear and front journal pins is movable relative to a
corresponding one of the rear and front pivot ends between a
latched position, where a respective one of the rear and front
journal pins pivotally secures a corresponding one of the rear and
front pivot ends to a corresponding one of the supporting member
and the cover shield, and a released position, where the respective
one of the rear and front journal pins is clear of the
corresponding one of the supporting member and the front pivot end
by being withdrawn therefrom.
Inventors: |
Chang; Yueh-Hsun; (Nan-Tou
Hsien, TW) |
Correspondence
Address: |
CHRISTIE, PARKER & HALE, LLP
PO BOX 7068
PASADENA
CA
91109-7068
US
|
Family ID: |
37447099 |
Appl. No.: |
11/134788 |
Filed: |
May 21, 2005 |
Current U.S.
Class: |
83/477.2 ;
83/478 |
Current CPC
Class: |
Y10T 83/7734 20150401;
B27G 19/10 20130101; Y10T 83/773 20150401; Y10T 83/2077 20150401;
B27G 19/02 20130101; Y10S 83/01 20130101 |
Class at
Publication: |
083/477.2 ;
083/478 |
International
Class: |
B23D 45/06 20060101
B23D045/06 |
Claims
1. A protective cover device adapted to be mounted on a worktable
of a sawing machine on which a workpiece is fed along a working
path in a longitudinal direction, comprising: a supporting member
having a lower end portion which is adapted to be secured on the
worktable, and an upper end portion which is opposite to said lower
end portion in an upright direction transverse to the longitudinal
direction and which has a rear pivot hole extending therethrough in
a transverse direction relative to both the upright direction and
the longitudinal direction; a cantilever having front and rear
pivot ends opposite to each other in the longitudinal direction; a
rear journal pin extending into said rear pivot hole to pivotally
secure said rear pivot end to said upper end portion such that said
rear pivot end is turnable about a rear axis in the transverse
direction between a lifted position where said front pivot end is
remote from said upper end portion, and a working position where
said front pivot end is closer to said upper end portion; a cover
shield which is configured to be adapted to cover a cutting blade
of the sawing machine, and which includes front and rear ends
opposite to each other in the longitudinal direction, and a middle
portion interposed therebetween, said front end extending downwards
to terminate at a nose edge, said middle portion having a front
pivot hole which extends in the transverse direction; and a front
journal pin extending into said front pivot hole and said front
pivot end to pivotally secure said middle portion to said front
pivot end of said cantilever such that said nose edge is brought to
be in sliding contact with an upper surface of the workpiece fed
along the working path by virtue of gravity when said rear pivot
end is in the working position; at least one of said rear and front
journal pins being movable relative to a corresponding one of said
rear and front pivot ends in the transverse direction between a
latched position, where a respective one of said rear and front
journal pins pivotally secures a corresponding one of said rear and
front pivot ends to a corresponding one of said upper end portion
and said middle portion by extending into a corresponding one of
said rear and front pivot holes, and a released position, where the
respective one of said rear and front journal pins is clear of the
corresponding one of said rear pivot hole and said front pivot end
by being withdrawn therefrom in the transverse direction.
2. The protective cover device of claim 1, wherein said rear pivot
end of said cantilever includes left and right lugs which are
spaced apart from each other in the transverse direction so as to
define an accommodation space for receiving said upper end portion
therein, and which respectively have left and right through holes,
said rear journal pin extending through said left through hole and
having an actuated end which extends into said accommodation space
so as to extend through said rear pivot hole in said upper end
portion to be placed in the latched position, said protective cover
further comprising: a rear push actuator having an actuating end
which confronts said actuated end, and an operated end which
extends outwardly of said right through hole and which is operable
to move said actuating end in the transverse direction so as to
push said actuated end to be clear of said rear pivot hole to
thereby move said rear journal pin to the released position; and a
biasing member disposed to bias said rear journal pin to the
latched position.
3. The protective cover device of claim 2, further comprising a
first guiding member disposed to be secured to said left lug, said
first guiding member including: a left stem which is configured to
pass through said left through hole, and which has an inserting
bore extending along the rear axis to be exposed to said
accommodation space so as to guide movement of said rear journal
pin into said inserting bore, and a left enlarged head which
extends leftwards from said left stem and outwardly of said left
through hole, and which forms, in cooperation with said left stem,
a left surrounding shoulder to abut against said left lug, said
biasing member being disposed in said inserting bore between said
left enlarged head and said rear journal pin to bias said actuated
end of said rear journal pin to the latched position.
4. The protective cover device of claim 3, wherein said left stem
has a left outer threaded surface that surrounds the rear axis,
said protective cover device further comprising a left tightening
member which threadedly engages said left outer threaded surface so
as to permit said left surrounding shoulder to be brought to abut
against said left lug.
5. The protective cover device of claim 4, further comprising a
second guiding member disposed to be secured to said right lug,
said second guiding member including: a right stem which is
disposed in and which extends rightwards and outwardly of said
right through hole, and a right enlarged head which extends
leftwards from said right stem into said accommodation space, and
which forms, in cooperation with said right stem, a right
surrounding shoulder to abut against said right lug, said right
enlarged head having an guiding bore which accommodates said
actuating end, and which extends along the rear axis to be
communicated with said inserting bore so as to permit said
actuating end to move along the rear axis to push said actuated end
clear of said rear pivot hole, said operated end of said rear push
actuator is disposed to extend through said right stem so as to
extend rightwards and outwardly of said right through hole.
6. The protective cover device of claim 5, wherein said right stem
has a right outer threaded surface that surrounds the rear axis,
said protective cover device further comprising a right tightening
member which threadedly engages said right outer threaded surface
so as to permit said right surrounding shoulder to be brought to
abut against said right lug.
7. The protective cover device of claim 2, wherein each of said
actuated end of said rear journal pin and said actuating end of
said rear push actuator has a round edge so as to facilitate
movement of said rear pivot end upwards and away from said upper
end portion while said actuated end of said rear journal pin is
kept in contact with said actuating end by the biasing action of
said biasing member in the released position.
8. The protective cover device of claim 1, wherein said cover
shield includes two side plates spaced apart from each other in the
transverse direction to define a mounting space for receiving said
cantilever therein, said front pivot hole extending through said
side plates, said front pivot end of said cantilever includes two
lugs which are spaced apart from each other in the transverse
direction and each of which has a through hole extending in the
transverse direction, and a releasing hole extending in the upright
direction and communicated with said through hole to form an
integral opening, said front journal pin including two journal
shafts, each of which has a shank extending through said front
pivot hole and terminating at a connecting end that is inserted
into said through hole in a respective one of said lugs so as to be
placed in the latched position, said shank having an operated end
opposite to said connecting end and disposed outwardly of a
respective one of said side plates; said protective cover device
further comprising two biasing members, each of which is disposed
to bias a respective one of said journal shafts to the latched
position, such that when said operated end is pressed against
biasing action of a respective one of said biasing members, said
connecting end is withdrawn to be clear of said through hole so as
to be moved to the released position, thereby permitting lifting
said shanks and said cover shield away from said lugs in the
upright direction.
9. The protective cover device of claim 8, wherein said front
journal pin includes two screw nuts, each of which is threadedly
engaged with said connecting end of said shank of a respective one
of said journal shafts against the biasing action of a respective
one of said biasing members such that a respective one of said
screw nuts is brought to abut against a respective one of said side
plates so as to retain said shank of the respective one of said
journal shafts in said through hole in the respective one of said
lugs in the latched position.
10. The protective cover device of claim 1, wherein said upper end
portion has a retaining hole extending therethrough in the
transverse direction, said protective cover device further
comprising a journal body which is disposed to ride on said upper
end portion and which has two tubular journal portions that are
disposed at two opposite sides of said upper end portion and that
respectively have two receiving holes aligned with said retaining
hole in the transverse direction; two hold-down members, each
having an upper pivot end which is journalled on a respective one
of said tubular journal portions, and a lower holding end which
extends downwardly from said upper pivot end and which is
configured such that said lower holding end is kept in sliding
contact with the workpiece in a cutting operation; and a retaining
pin which is received in one of said receiving holes, which extends
in the transverse direction, and which is movable relative to said
journal body in the transverse direction between a latched
position, where said retaining pin extends into said retaining hole
so as to retain said journal body on said upper end portion, and a
released position, where said retaining pin is clear of said
retaining hole by being withdrawn therefrom in the transverse
direction.
11. The protective cover device of claim 10, further comprising a
first biasing member disposed to respectively bias said lower
holding ends of said hold-down members downwardly toward the
worktable.
12. The protective cover device of claim 11, further comprising: a
middle push actuator extending through the other one of said
receiving holes towards said one of said receiving holes to be
operated to push said retaining pin in the transverse direction so
that said retaining pin is clear of said retaining hole, thereby
moving said retaining pin to the released position; and a second
biasing member disposed to bias said retaining pin to the latched
position.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] This invention relates to a protective cover device, more
particularly to a protective cover device adapted to be mounted on
a worktable of a sawing machine on which a workpiece is fed so as
to cover a cutting blade of the sawing machine.
[0003] 2. Description of the Related Art
[0004] Referring to FIG. 1, a conventional protective cover device
10 is shown to include a supporting member 11, a cover shield 12,
and a parallel linkage 13. The supporting member 11 has a lower end
112 secured on a worktable of a sawing machine (not shown). The
cover shield 12 defines an accommodation space 121 configured to
cover a circular saw blade (not shown) of the sawing machine. The
parallel linkage 13 includes two parallel levers 131, 132, each
pivoted to the cover shield 12 and an upper end 111 of the
supporting member 11 so as to permit turning of the cover shield 12
relative to the supporting member 11.
[0005] Although the cover shield 12 can be moved to cover the saw
blade for protecting the operator from flying wood shavings during
sawing operation, the cover shield 12 is not detachable from the
supporting member 11 and may therefore interfere with the
replacement of the saw blade.
SUMMARY OF THE INVENTION
[0006] The object of the present invention is to provide a
protective cover device which is detachably assembled to a
worktable of a sawing machine so as to facilitate replacement of a
saw blade on the machine.
[0007] According to this invention, the protective cover device
includes a supporting member having a lower end portion which is
adapted to be secured on a worktable of a sawing machine, and an
upper end portion which is opposite to the lower end portion in an
upright direction and which has a rear pivot hole extending
therethrough in a transverse direction. A cantilever has front and
rear pivot ends opposite to each other in a longitudinal direction
such that a rear journal pin extends into the rear pivot hole to
pivotally secure the rear pivot end to the upper end portion. Thus,
the rear pivot end is turnable between a lifted position where the
front pivot end is remote from the upper end portion, and a working
position where the front pivot end is closer to the upper end
portion. A cover shield is adapted to cover a cutting blade of the
sawing machine, and includes front and rear ends opposite to each
other in the longitudinal direction, and a middle portion
interposed therebetween. The front end extends downwards to
terminate at a nose edge. The middle portion has a front pivot hole
extending in the transverse direction such that a front journal pin
extends into the front pivot hole and the front pivot end of the
cantilever to pivotally secure the middle portion to the front
pivot end of the cantilever. Thus, the nose edge is brought to be
in sliding contact with an upper surface of a workpiece on the
worktable by virtue of gravity when the rear pivot end is in the
working position. At least one of the rear and front journal pins
is movable relative to a corresponding one of the rear and front
pivot ends in the transverse direction between a latched position,
where a respective one of the rear and front journal pins pivotally
secures a corresponding one of the rear and front pivot ends to a
corresponding one of the upper end portion and the middle portion
by extending into a corresponding one of the rear and front pivot
holes, and a released position, where the respective one of the
rear and front journal pins is clear of the corresponding one of
the rear pivot hole and the front pivot end by being withdrawn
therefrom in the transverse direction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Other features and advantages of the present invention will
become apparent in the following detailed description of the
preferred embodiment of the invention, with reference to the
accompanying drawings, in which:
[0009] FIG. 1 is a schematic view of a conventional protective
cover device;
[0010] FIG. 2 is a perspective view of the preferred embodiment of
a protective cover device according to this invention;
[0011] FIG. 3 is a schematic view of the preferred embodiment;
[0012] FIG. 4 is an exploded perspective view of the preferred
embodiment;
[0013] FIG. 5 is an exploded perspective view of the preferred
embodiment in part;
[0014] FIG. 6 is a fragmentary assembled sectional view of the
preferred embodiment shown in FIG. 5, showing a rear journal pin in
a latched position;
[0015] FIG. 7 is a fragmentary sectional view similar to FIG. 6,
showing how a cantilever is detached from a supporting member;
[0016] FIG. 8 is a schematic view of the preferred embodiment,
showing the cantilever is detached from the supporting member;
[0017] FIG. 9 is an exploded perspective view of the preferred
embodiment in part;
[0018] FIG. 10 is a fragmentary assembled sectional view of the
preferred embodiment shown in FIG. 9, showing a front journal pin
in a latched position;
[0019] FIG. 11 is a fragmentary sectional view similar to FIG. 10,
showing how a cover shield is detached from the cantilever;
[0020] FIG. 12 is a schematic view of the preferred embodiment
showing that the cover shield is detached from the cantilever;
[0021] FIG. 13 is an exploded perspective view of the preferred
embodiment in part;
[0022] FIG. 14 is a fragmentary assembled sectional view of the
preferred embodiment shown in FIG. 13, showing a retaining pin in a
latched position;
[0023] FIG. 15 is a fragmentary sectional view similar to FIG. 14,
showing how two hold-down members are detached from the supporting
member; and
[0024] FIG. 16 is a schematic view of the preferred embodiment,
showing that the hold-down members are detached from the supporting
member.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0025] Referring to FIGS. 2 to 4, the preferred embodiment of a
protective cover device according to the present invention is
adapted to be mounted on a worktable of a sawing machine (not
shown) on which a workpiece (not shown) is fed along a working path
in a longitudinal direction, and is shown to comprise a supporting
member 20, a cantilever 40, a cover shield 30, a rear journal unit
50, a front journal unit 60, and a hold-down unit 70.
[0026] The supporting member 20 is in the form of a flat plate, and
has a lower end portion 21 which is adapted to be secured on the
worktable of the sawing machine, and an upper end portion 22 which
is opposite to the lower end portion 21 in an upright direction
transverse to the longitudinal direction and which has a rear pivot
hole 23 and a retaining hole 24 extending therethrough in a
transverse direction relative to both the upright direction and the
longitudinal direction, and a retaining edge 25 disposed upwardly
of the retaining hole 24. The rear pivot hole 23 is round, and the
retaining hole 24 is rectangular.
[0027] The cantilever 40 has front and rear pivot ends 401,402
opposite to each other in the longitudinal direction. With further
reference to FIGS. 5 and 6, the rear pivot end 402 includes left
and right lugs 43,44 which are spaced apart from each other in the
transverse direction so as to define an accommodation space for
receiving the upper end portion 22 of the supporting member 20
therein, and which respectively have left and right through holes
431,441.
[0028] The rear journal unit 50 includes a first guiding member 51,
a second guiding member 52, a rear journal pin 53, a rear push
actuator 54, and a biasing member 55. The first guiding member 51
includes a left stem 5112 which is configured to pass through the
left through hole 431, which has an inserting bore 5111 extending
along a rear axis in the transverse direction to be exposed to the
accommodation space between the lugs 43,44, and which has a left
outer threaded surface that surrounds the rear axis and that is
threadedly engaged with a left tightening member 512, and a left
enlarged head 511 which extends leftwards from the left stem 5112
and outwardly of the left through hole 431, and which forms, in
cooperation with the left stem 5112, a left surrounding shoulder to
abut against the left lug 43 so as to be secured to the left lug
43.
[0029] The second guiding member 52 includes a right stem 5212
which is disposed in and which extends rightwards and outwardly of
the right through hole 441, and a right enlarged head 521 which
extends leftwards from the right stem 5212 into the accommodation
space between the lugs 43, 44, and which forms, in cooperation with
the right stem 5212, a right surrounding shoulder. The right stem
5212 has a right outer threaded surface which surrounds the rear
axis and which is threadedly engaged with a right tightening member
522 so as to permit the right surrounding shoulder to be brought to
abut against the right lug 44 so as to be secured to the right lug
44. The right enlarged head 521 has a guiding bore 5211 which
extends along the rear axis to communicate with the inserting bore
5111.
[0030] The rear journal pin 53 is received in and is guided to move
into the inserting bore 5111, and has an actuated end 531 which can
extend through the rear pivot hole 23 to pivotally secure the rear
pivot end 402 of the cantilever 40 to the upper end portion 22 of
the supporting member 20, as shown in FIG. 6, such that the rear
pivot end 402 is turnable about the rear axis between a lifted
position where the front pivot end 401 is remote from the upper end
portion 22, and a working position where the front pivot end 401 is
closer to the upper end portion 22.
[0031] The biasing member 55 is disposed in the inserting bore 5111
between the left enlarged head 511 and the actuated end 531 of the
rear journal pin 53 to bias the actuated end 531 to a latched
position, where the actuated end 531 extends through the rear pivot
hole 23 so as to pivotally secure the rear pivot end 402 to the
upper end portion 22.
[0032] The rear push actuator 54 has an actuating end 542 which
confronts the actuated end 531 of the rear journal pin 53, and an
operated end 541 which extends outwardly of the guiding bore 5211
and which is pushed to move the actuating end 542 in the transverse
direction so as to push the actuated end 531 of the rear journal
pin 53 along the rear axis against the biasing action of the
biasing member 55 to a released position, where the actuated end
531 is clear of the rear pivot hole 23, thereby permitting
separation of the rear pivot end 402 of the cantilever 40 from the
upper end portion 22 of the supporting member 20, as shown in FIGS.
7 and 8.
[0033] Preferably, each of the actuated end 531 of the rear journal
pin 53 and the actuating end 542 of the rear push actuator 54 has a
round edge so as to facilitate movement of the rear pivot end 402
upwards and away from the upper end portion 22 while the actuated
end 531 is kept in contact with the actuating end 542 by the
biasing action of the biasing member 55 in the released
position.
[0034] Referring once again to FIG. 4, the cover shield 30 is
configured to be adapted to cover a cutting blade (not shown) of
the sawing machine, and includes two side plates 31 which are
spaced apart from each other in the transverse direction to define
a mounting space 33 for receiving the cantilever 40 therein, and a
top wall 32 interconnecting the side plates 31. Each of the side
plates 31 includes front and rear ends opposite to each other in
the longitudinal direction, and a middle portion interposed
therebetween. The front end extends downwards to terminate at a
nose edge 34. The middle portion has a front pivot hole 311 which
extends therethrough in the transverse direction. Thus, the cover
shield 30 is movable by the cantilever 40 so as to be detached from
the supporting member 20 when the rear pivot end 402 of the
cantilever 40 is separated from the upper end portion 22 of the
supporting member 20, as shown in FIG. 8.
[0035] Further, referring to FIGS. 9 and 10, the front pivot end
401 of the cantilever 40 includes two lugs 41 which are spaced
apart from each other in the transverse direction, and an upper
wall 42 which interconnects the lugs 41. Each of the lugs 41 has a
through hole 411 extending in the transverse direction, and a
releasing hole 421 which extends in the upright direction and which
is communicated with the through hole 411 by a communicating slot
412 to form an integral opening.
[0036] The front journal unit 60 includes a front journal pin with
two journal shafts 61 and two screw nuts 62, and two biasing
members 63. Each of the journal shafts 61 has a shank 611 which
extends through the respective front pivot hole 311 to pivotally
secure the middle portions of the side plats 31 of the cover shield
30 to the front pivot end 401 of the cantilever 40 such that the
nose edges 34 of the cover shield 30 are brought to be in sliding
contact with an upper surface of the workpiece fed along the
working path by virtue of gravity when the rear pivot end 402 is in
the working position. The shank 611 terminates at a connecting end
6111 which is threadedly engaged with the respective screw nut 62.
The journal shaft 61 further has an operated end 612 which is
opposite to the connecting end 6111 and which is disposed outwardly
of the respective side plate 31. An operated slot 6121 is formed in
the operated end 612 to receive a hand tool (not shown) used to
fasten the connecting end 6111 and the screw nut 62. Each of the
biasing members 63 is sleeved on the shank 611 of the respective
journal shaft 61 between the operated end 612 and the respective
side plate 31. By virtue of the threaded engagement between the
screw nut 62 and the connecting end 6111 against the biasing action
of the respective biasing member 63, each screw nut 62 is brought
to abut against the respective side plate 31 so as to be retained
in the respective through hole 411, thereby placing the respective
journal shaft 61 in a latched position by the biasing action of the
respective biasing member 63, as shown in FIG. 10.
[0037] As shown in FIG. 11, when the operated end 612 is pressed
against the biasing action of the respective biasing member 63, the
connecting end 6111 and the screw nut 62 are withdrawn inwardly to
be clear of the respective through hole 411 so as to be moved to a
released position, thereby permitting lifting of the cover shield
30 away from the lugs 41 in the upright direction, as shown in FIG.
12.
[0038] Furthermore, referring to FIGS. 13 and 14, the hold-down
unit 70 includes a journal body 71, two hold-down members 72, a
first biasing member 74, a retaining pin 76, a second biasing
member 77, and a middle push actuator 78.
[0039] The journal body 71 is disposed to ride on the retaining
edge 25 of the upper end portion 22 of the supporting member 20
through a slot 711, and has two tubular journal portions 712 which
are disposed at two opposite sides of the upper end portion 22 of
the supporting member 20 and which respectively have receiving
holes 713 that are aligned with the retaining hole 24 in the
transverse direction and that are in the form of screw holes so as
to threadedly engage screw bolts 73. In addition, the journal body
71 is formed with a passage hole 714 that extends in the transverse
direction. A barrier shaft 75 extends through the passage hole 714,
and has two ends extending outwardly thereof.
[0040] Each of the hold-down members 72 has an upper pivot end 722
which is journalled on the respective tubular journal portion 712
through a hole 721, and a lower holding end 723 which extends
downwardly from the upper pivot end 722 and which is configured to
be kept in sliding contact with the workpiece sawn by the cutting
blade so as to stabilize the sawing operation of the sawing
machine.
[0041] The first biasing member 74 is a torsion spring, and
includes an abutting portion 741 abutting against the supporting
member 20, two coiled spring portions 742 respectively surrounding
the tubular journal portions 712, and two hooks 743 respectively
abutting against the hold-down members 72 so as to bias the lower
holding ends 723 of the hold-down members 72 downwardly toward the
worktable. Moreover, the turning of the lower holding ends 723 is
limited by abutment of the upper pivot ends 722 against the ends of
the barrier shaft 75.
[0042] The retaining pin 76 is substantially rectangular in shape,
and mates with the retaining hole 24 in the upper end portion 22 of
the supporting member 20. The retaining pin 76 is received in the
receiving hole 713 in one of the tubular journal portions 712,
extends in the transverse direction, and is movable relative to the
journal body 71 in the transverse direction. The second biasing
member 77 is disposed in a seat hole 732 in one of the screw bolts
73. Thus, the retaining pin 76 is movable between a latched
position, as shown in FIG. 14, where the retaining pin 76 extends
into the retaining hole 24 so as to retain the journal body 71 on
the upper end portion 22, and a released position, as shown in FIG.
15, where the retaining pin 76 is clear of the retaining hole 24
when pressed out of the retaining hole 24 in the transverse
direction against the biasing action of the second biasing member
77.
[0043] The middle push actuator 78 extends through the receiving
hole 713 in the other one of the tubular journal portions 712, and
has an actuating end 782 extending to be in contact with an
actuated end 761 of the retaining pin 76, and an operated end 781
extending out of the respective screw bolt 73 through a through
hole 733 such that the operated end 781 can be operated to push the
retaining pin 76 in the transverse direction against the biasing
action of the second biasing member 77 so that the retaining pin 76
is clear of the retaining hole 24, thereby permitting separation of
the journal body 71 from the supporting member 20, as shown in
FIGS. 15 and 16.
[0044] Preferably, each of the actuated end 761 of the retaining
pin 76 and the actuating end 782 of the middle push actuator 78 has
a round edge so as to facilitate movement of the retaining pin 76
upwards and away from the upper end portion 22 while the actuated
end 761 is kept in contact with the actuating end 782 by the
biasing action of the second biasing member 77 in the released
position.
[0045] As illustrated, when it is desired to replace the cutting
blade of the sawing machine, the cover shield 30 and the cantilever
40 can be detached from the supporting member 20 by separating the
rear pivot end 402 of the cantilever 40 from the upper end portion
22 of the supporting member 20, as shown in FIGS. 7 and 8.
Alternatively, the cover shield 30 can be detached alone from the
supporting member 20 by separating the shanks 611 and the screw
nuts 62 from the releasing holes 421 in the front pivot end 401 of
the cantilever 40, as shown in FIGS. 11 and 12. Thus, replacement
of the cutting blade is convenient to conduct. Moreover, the
hold-down unit 70 can be detached from the supporting member 20 by
removing the journal body 71 from the retaining hole 24 in the
supporting member 20.
[0046] While the present invention has been described in connection
with what is considered the most practical and preferred
embodiment, it is understood that this invention is not limited to
the disclosed embodiment but is intended to cover various
arrangements included within the spirit and scope of the broadest
interpretations and equivalent arrangements.
* * * * *